LT5557 - 400MHz to 3.8GHz 3.3V High Linearity Downconverting RF Mixer

The LT5557 active mixer is optimized for high linearity, wide dynamic range downconverter applications. The IC includes a high speed differential LO buffer amplifier driving a double-balanced mixer. Broadband, integrated transformers on the RF and LO inputs provide singleended 50Ω interfaces. The differential IF output allows convenient interfacing to differential IF filters and amplifiers, or is easily matched to drive a single-ended 50Ω load, with or without an external transformer.

The RF input is internally matched to 50Ω from 1.6GHz to 2.3GHz, and the LO input is internally matched to 50Ω from 1GHz to 5GHz. The frequency range of both ports is easily extended with simple external matching. The IF output is partially matched and usable for IF frequencies up to 600MHz.

The LT5557’s high level of integration minimizes the total solution cost, board space and system-level variation.

  • Wide RF Frequency Range: 400MHz to 3.8GHz*
  • High Input IP3: 25.6dBm at 900MHz 24.7dBm at 1950MHz 23.7dBm at 2.6GHz
  • Conversion Gain: 3.3dB at 900MHz 2.9dB at 1950MHz
  • –3dBm LO Drive Level
  • Low LO Leakage
  • Low Noise Figure: 10.6dB at 900MHz 11.7dB at 1950MHz
  • Low Power: 3.3V/269mW
  • 50Ω Single-Ended RF and LO Ports
  • Very Few External Components
  • 16-Lead (4mm × 4mm) QFN Package
Typical Application
LT5557 Typical Application
LT5557 Typical Application
  • Cellular, CDMA, WCDMA, TD-SCDMA and UMTS Infrastructure
  • WiMAX
  • Wireless Infrastructure Receiver
  • Wireless Infrastructure PA Linearization
  • 900MHz/2.4GHz/3.5GHz WLAN
LT5557 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT5557EUF#PBF4x4 QFN-16E$8.48$5.95
LT5557EUF#TRPBF4x4 QFN-16E$6.00
Demo Boards
Part NumberDescriptionPrice
DC1131ALT5557EUF | 400MHz to 3.8GHz 3.3V Down Mixer, 1.95GHz RFin, 240MHz balun IF out.$125.00
DC910ALT5557EUF | 400MHz to 3.8GHz down mixer, 1.95GHz RFin, 240MHz discrete matching IF$125.00
Design Note
Reliability Data
Product Selector Card
LT Journal
Press Release
Software and Simulation
CAD Symbol
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R409 - Reliability Data
Digital Predistortion Solutions
Passive Mixers Increase Gain and Decrease Noise When Compared to Active Mixers in Downconverter Applications
400MHz to 3.8GHz High Linearity Downconverting Mixer Improves Performance for 3G & WiMAX Basestations
LT5557 S-Parameters
LT5557 Footprints and Symbols